Festival-goers arrive at Worthy Farm in Somerset for the Glastonbury Festival on June 22, 2016. Yui Mok/Press Association Glastonbury Festival, one of the world's biggest music events held every summer in Somerset, is open to the public today (June 22). But heavy rain has filled the venue, Worthy Farm, with pools of mud and waterlogged fields.

Festival-goers who have been to Glastonbury in previous years may be used to the wet weather, yet many people still turn up to the five-day event unprepared. And more than 100,000 people are expected to show up for the mud-packed event, according to the BBC.

The festival has even issued a statement on its Twitter page about the road traffic being caused by the weather, and has encouraged attendees to wait to drive to the venue. "There is no need to rush," the tweet reads. "The longer you leave it the less you will have to queue."

As Glastonbury kicks off, we've compiled photos of revellers as they brave the miserable conditions.

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Though Glastonbury's entertainment won't start until this Friday, June 24, people began arriving as early as yesterday, June 21. This man carried his belongings in a wheelbarrow and dodged puddles of mud to get there.

Yui Mok/Associated Press

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Due to heavy rain, Worthy Farm was already soaked on June 21.

Press Association

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This part of the site is completely waterlogged.

Press Association

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But that hasn't discouraged hordes of music fans from turning up. Here's a crowd of festival-goers arriving on June 22 in rainproof clothing to see acts like headliners Adele, Muse, and Coldplay perform later this week.

Ben Birchall/Press Association

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Some people are less enthusiastic about the miserable weather, though.

Yui Mok/Press Association

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These festival-goers came prepared wearing wellington boots and their hoods up.

Ben Birchall/Press Association

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Many attendees are having to push their belongings through muddy fields, and surely regret packing heavily for the five-day festival.

Ben Birchall/Press Association

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These festival-goers have resorted to wheeling their wrapped-up belongings right through the soggy fields.

Yui Mok/Press Association

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Meanwhile, some people are carrying their things on their heads to avoid the sludge, like this man...

Yui Mok/Press Association

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...and this festival-goer, who seems a lot happier to be at Glastonbury.

Press Association

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Like many others, this man cycling through slippery fields is covered in mud.

Richard Gray/EMPICS Entertainment

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Despite the wet weather, the festival will go on. As well as music, hundreds of on-site food stalls and traders will be there to offer refreshment and merchandise.

Richard Gray/EMPICS Entertainment

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It's not just the site that's a mess. Traffic leading up to the event has also been a nightmare due to the wet conditions, with the queue time as long as seven hours to get into the festival grounds, the BBC reports.